QUOTE (Lotus Flower @ Nov 26 2007, 09:24 PM)

I wonder if this would go part way to explaining why sometimes, when searching for an object indoors, for example, we fail to see it even when it is sitting there, right under our noses

Someone else comes along whilst we are cussing and shoving things about, searching.
"What are you looking for?"
"My keys!!!"
"They are there....." pointing
"Where????"
"For goodness sake, THERE" hands them to person

QUOTE
Even more fascinating, to me, was the finding through optics that the image represented on the retina of the Human eye is reversed. Yes, I mean upside down. The image you process in your mind is converted, somewhere, somehow, to a correct right-side up view. It sounds odd. But, why is this?
That is a very confusing idea and it is almost right. Take a glass orb and fill it with water and look through it or look through a large clear glass marble. Everything is upside down and backwards. That is just the eye itself. In other words, that is what each eye sees. That is the first. You also have the rods and cones. The rods are for daytime and the cones are for nighttime vision. It is just so complicated.
Then the optic nerves cross (the optic chiasm) to give you the full picture that you see. If you have damage to any rod or cone, that part of the picture is not there. That is why you don't see certain things.
After the optic nerves cross, the whole picture that you see is in both nerves. If you have damage to either eye, the rods or cones, or the eye itself, that is what you see. Cover either eye and that is the full picture you see. But, it is much more complicated than that.
Where do the optic nerves end? They end in the back of the brain.
Ever heard of iridology? I will explain.
The iris of the eye is a 3-D image of the organs of the body. The pupil is the life force and it is surrounded by the intestines. That is where it gets so complicated. You can google that and see what is where in the eye. Iridology is not recognized as a valid study of the iris because the eye may just respond to the impulse from the spirit.
My own body does have signs in the iris of what is not right and I have studied other people and have suprised them by knowing problems they have had. Notice I said 'they have had,' not what they have. Wikipedia has that a British iridology study was done with people who 'did have' gallstones and they could not tell by looking at the iris that they had hat problem. DUH! Gallstones are not a poblem until they form a block of the passages of the liver and galbladder. You naturally have stones in the liver and gallbladder.
That is off the subject, but the body itself does not control the vision, the brain does; the whole brain.
After the nerves cross, they travel through the brain past the ear . . . never mind.
The keys are probably in the blind spot when they look for 'em the first time. And since they can't see 'em the first time, they get mad and throw something and stomp their feet. Then they look and look somewhere else and they can't find them. Days later they go back and the keys are right where they put 'em.